Source : Webster's Revised Unabridged Dictionary (1913)

Zygodactylae \Zyg`o*dac"ty*l[ae]\, n. pl. [NL.] (Zo["o]l.)
   The zygodactylous birds. In a restricted sense applied to a
   division of birds which includes the barbets, toucans, honey
   guides, and other related birds.